Moraceæ. Mulberry Family
Morus Rubra, L.
Mulberry
Habitat and Range.—Banks of rivers, rich woods.
Canadian shore of Lake Erie.
A rare tree in New England. Maine,—doubtfully reported; New Hampshire,—Pemigewasset valley, White mountains (Matthews); Vermont,—northern extremity of Lake Champlain, banks of the Connecticut (Flagg), Pownal (Oakes), North Pownal (Eggleston); Massachusetts,—rare; Rhode Island,—no station reported; Connecticut,—rare; Bristol, Plainville, North Guilford, East Rock and Norwich (J. N. Bishop).
South to Florida; west to Michigan, South Dakota, and Texas.
Habit.—A small tree, 15-25 feet in height, with a trunk diameter of 8-15 inches; attaining much greater dimensions in the Ohio and Mississippi basins; a wide-branching, rounded tree, characterized by a milky sap, rather dense foliage, and fruit closely resembling in shape that of the high blackberry.
Bark.—Trunk light brown, rough, and more or less furrowed according to age; larger branches light greenish-brown; season’s shoots gray and somewhat downy.
Winter Buds and Leaves.—Buds ovate, obtuse. Leaves simple, alternate, 4-8 inches long, two-thirds as wide, rough above, yellowish-green and densely pubescent when young; at maturity dark green and downy beneath, turning yellow in autumn; conspicuously reticulated; outline variable, ovate, obovate, oblong or broadly oval, serrate-dentate with equal teeth, or irregularly 3-7-lobed; apex acuminate; base heart-shaped to truncate; stalk 1-2 inches long; stipules linear, serrate, soon falling.
Inflorescence.—May. Appearing with the leaves from the season’s shoots, in axillary spikes, sterile and fertile flowers sometimes on the same tree, sometimes on different trees,—sterile flowers in spreading or pendulous spikes, about 1 inch long; calyx 4-parted; petals none; stamens 4, the inflexed filaments of which suddenly straighten themselves as the flower expands: fertile spikes spreading or pendent; calyx 4-parted, becoming fleshy in fruit; ovary sessile; stigmas 2, spreading.
Fruit.—July to August. In drooping spikes about 1 inch long and ½ inch in diameter; dark purplish-red, oblong, sweet and edible; apparently a simple fruit but really made up of the thickened calyx lobes of the spike.
Horticultural Value.—Hardy in southern New England; grows rapidly in a good, moist soil in sun or shade; the large leaves start late and drop early; useful where it is hardy, in low tree plantations or as an undergrowth in woods; readily transplanted, but seldom offered for sale by nurserymen or collectors; propagated from seed.
1. Winter buds.
2. Branch with sterile flowers.
3. Sterile flower with stamens incurved.
4. Sterile flower expanded.
5. Branch with fertile flowers.
6. Fertile flower, side view.
7. Fruiting branch.